KR20160068777A - Defense against false detection of semi-persistent scheduling (sps) activation or release - Google Patents

Abstract

Certain aspects of the present disclosure provide techniques for defending against false Semi-persistent Scheduling (SPS) activation detection and / or missed SPS release. According to certain aspects, a user equipment (UE) is configured to detect that one or more conditions for semi-persistent scheduling (SPS) activation or deactivation are satisfied based on downlink transmission and to determine one or more metrics And determine that a valid SPS activation or deactivation has occurred if one or more metrics meet one or more criteria. According to certain aspects, the UE may determine that a valid semi-persistent scheduling (SPS) activation has occurred, detect multiple PDSCH CRC failures, and implicitly declare an SPS release based on the detection.

Description

DEFENSE AGAINST FALSE DETECTION OF SEMI-PERSISTENT SCHEDULING (SPS) ACTIVATION OR RELEASE}

Ⅰ. 35 Priority claim under U.S.C. §119

This patent application claims priority to U.S. Provisional Application No. 61 / 887,331 entitled " Defense Against False Detection of Semi-Persistent-Scheduling (SPS) Activation or Release " filed on October 4, 2013, Assigned to the assignee hereof and expressly incorporated herein by reference.

Ⅱ. Field

This disclosure is generally directed to taking action to defend against scenarios that result in false detection of semi-persistent-scheduling (SPS) activation or deactivation.

Ⅲ. background

Wireless communication networks are widely deployed to provide a variety of communication content such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multi-access networks capable of supporting multiple users by sharing available network resources. Examples of such multi-access networks include, but are not limited to, code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) FDMA (SC-FDMA) networks.

A wireless communication network may include multiple base stations capable of supporting communication for multiple user equipments (UEs). The UE may also communicate with the base station on the downlink and uplink. The downlink (or forward link) refers to the communication link from the base station to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the base station.

Various reference signals (RSs) known to the UEs may be transmitted on the downlink, for example, to facilitate channel estimation. In some cases, cell-specific RSs are provided that are common to all UEs in the cell. UE-specific RSs embedded in data targeted at particular UEs may also be transmitted. In addition, Multimedia Broadcast Single Frequency Network (MBSFN) -specific RSs may also be provided in the case of MBSFN configurations. These RSs typically occupy specified resource elements (REs) in orthogonal frequency division multiplexed (OFDM) symbols.

Certain aspects of the present disclosure provide a method for wireless communication by a user equipment (UE). The method generally includes detecting that one or more conditions for semi-persistent scheduling (SPS) activation or deactivation are satisfied based on downlink transmission, generating one or more metrics related to downlink transmission, Lt; RTI ID = 0.0 > SPS < / RTI > activation or deactivation has occurred.

Certain aspects of the present disclosure provide an apparatus for wireless communication. The apparatus typically detects that one or more conditions for semi-persistent scheduling (SPS) activation or deactivation are satisfied based on downlink transmission, generates one or more metrics associated with the downlink transmission, At least one processor configured to determine that a valid SPS activation or deactivation has occurred if the criteria above are met, and a memory coupled with the at least one processor.

Certain aspects of the present disclosure provide an apparatus for wireless communication. The apparatus generally comprises means for detecting that one or more conditions for semi-persistent scheduling (SPS) activation or deactivation are satisfied based on downlink transmission, means for generating one or more metrics related to downlink transmission, and one If the above metrics meet one or more criteria, a determination is made that a valid SPS activation or deactivation has occurred.

Certain aspects of the present disclosure provide a computer-readable medium for wireless communication by a user equipment (UE). The computer readable medium is generally adapted to detect that one or more conditions for semi-persistent scheduling (SPS) activation or deactivation are satisfied based on downlink transmission, generate one or more metrics related to downlink transmission, If the metrics meet one or more criteria, a determination is made that a valid SPS activation or deactivation has occurred.

Certain aspects of the present disclosure provide a method for wireless communication by a user equipment (UE). The method generally includes determining that a valid semi-persistent scheduling (SPS) activation has occurred, detecting multiple Physical Downlink Shared Channel (PDSCH) CRC failures, and implicitly declaring an SPS release based on the detection .

Certain aspects of the present disclosure provide an apparatus for wireless communication. The apparatus generally includes at least one processor configured to determine that a valid semi-persistent scheduling (SPS) activation has occurred, to detect multiple PDSCH CRC failures, and to implicitly declare an SPS release based on the detection .

Certain aspects of the present disclosure provide an apparatus for wireless communication. The apparatus generally includes means for determining that a valid semi-persistent scheduling (SPS) activation has occurred, means for detecting multiple PDSCH CRC failures, and means for implicitly declaring an SPS release based on the detection do.

Certain aspects of the present disclosure provide a computer readable medium for wireless communication. The computer readable medium generally includes instructions for determining that a valid semi-persistent scheduling (SPS) activation has occurred, detecting multiple PDSCH CRC failures, and implicitly declaring an SPS release based on the detection .

1 shows a wireless communication network.
2 shows a block diagram of a base station and a UE.
Fig. 3 shows an example frame structure.
4 shows two exemplary subframe formats for the downlink.
5 illustrates an exemplary base station and user equipment, in accordance with certain aspects of the present disclosure.
Figure 6 illustrates exemplary operations that may be performed by user equipment, in accordance with certain aspects of the present disclosure.
Figure 7 illustrates exemplary operations that may be performed by user equipment, in accordance with certain aspects of the present disclosure.

Certain aspects of the present disclosure provide techniques for defending against adverse effects that may be caused by a user equipment (UE) that incorrectly detects an SPS activation or deactivation. For example, techniques may help avoid UEs mis-detecting positive SPS DL activation which may result in unnecessary download (DL) decoding attempts. As another example, techniques may help the UE avoid avoiding missing SPS releases, or, in some cases, allow the UE to implicitly release when SPS releases are missed.

The techniques described herein may be used for various wireless communication networks such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other networks. The terms "network" and "system" are often used interchangeably. CDMA networks may implement radio technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, and the like. UTRA includes wideband CDMA (WCDMA), time division synchronous CDMA (TD-SCDMA), and other variants of CDMA. cdma2000 covers IS-2000, IS-95 and IS-856 standards. The TDMA network may implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA networks may implement radio technologies such as Evolved UTRA (U-UTRA), Ultra Mobile Broadband (UMB), Wi-Fi, IEEE 802.16 (WiMAX), IEEE 802.20, and Flash-OFDM®. UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS). 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) in both Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD) Are new releases of UMTS that use E-UTRA employing FDMA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from the organization named "3rd Generation Partnership Project" (3GPP). cdma2000 and UMB are described in documents from the organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein may also be used for the wireless networks and radio technologies described above as well as for other wireless networks and radio technologies. For clarity, certain aspects of techniques are described below for LTE, and LTE terminology is used in most of the following descriptions.

FIG. 1 illustrates a wireless communication network 100 in which the techniques of the present disclosure may be practiced. For example, the UEs 120 shown in FIG. 1 may utilize the techniques described herein to defend against scenarios that result in false detection of semi-persistent-scheduling (SPS) activation or deactivation.

According to certain aspects, the wireless communication network 100 may be an LTE network or some other wireless network. The wireless communication network 100 may include a plurality of evolved Node Bs (eNBs) 110 and other network entities. An eNB is an entity that communicates with UEs and may also be referred to as a base station, a Node B, an access point, and so on. Each eNB may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the coverage area of the eNB and / or the eNB subsystem serving this coverage area, depending on the context in which the term is used.

The eNB may provide communication coverage for macro cells, picocells, femtocells, and / or other types of cells. The macrocell may cover a relatively large geographic area (e.g., a few kilometers radius) and may allow unrestricted access by service-joined UEs. The picocell may cover a relatively small geographical area and may allow unrestricted access by the UEs subscribed to the service. The femtocell may cover relatively small geographic areas (e. G., The grooves) and may be associated with UEs (e. G., UEs in the Closed Subscriber Group RTI ID = 0.0 > access. ≪ / RTI > The eNB for a macro cell may also be referred to as a macro eNB. The eNB for the picocell may also be referred to as pico eNB. An eNB for a femtocell may be referred to as a femto eNB or a home eNB (HeNB). 1, eNB 110a may be a macro eNB for macrocell 102a, eNB 110b may be a pico eNB for piconel 102b, and eNB 110c may be a macro eNB for macrocell 102a. Or a femto eNB for femtocell 102c. The eNB may support one or more (e.g., three) cells. The terms "eNB "," base station "and" cell "may be used interchangeably herein.

The wireless communication network 100 may also include relay stations. A relay station is an entity capable of receiving a transmission of data from an upstream station (eNB or UE, for example) and transmitting a transmission of data to a downstream station (e. G., A UE or an eNB). The relay station may also be a UE capable of relaying transmissions to other UEs. In the example shown in Figure 1, relay station 110d may communicate with macro eNB 110a and UE 120d to facilitate communication between eNB 110a and UE 120d. The relay station may also be referred to as a relay eNB, a relay base station, a relay, and the like.

The wireless communication network 100 may be a heterogeneous network that includes different types of eNBs, e.g., macro eNBs, pico eNBs, femto eNBs, relay eNBs, and the like. These different types of eNBs may have different transmission power levels, different coverage areas, and different impacts on interference in the wireless communication network 100. For example, macro eNBs may have a high transmit power level (e. G., 5 to 40 watts), while pico eNBs, femto eNBs, and relay eNBs may have lower transmit power levels To 2 watts).

The network controller 130 may couple to the set of eNBs and provide coordination and control for these eNBs. The network controller 130 may communicate with the eNBs via a backhaul. eNBs may also communicate with each other indirectly or directly via, for example, wireless or wired backhaul.

The UEs 120 may be distributed throughout the wireless communication network 100, and each UE may be stationary or mobile. The UE may also be referred to as a terminal, a mobile station, a subscriber unit, a station, and so on. The UE may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a smartphone, a netbook, According to certain aspects, the UE 120 may perform certain techniques for defending against adverse effects that may be caused by a UE that incorrectly detects an SPS activation or deactivation. In one example, to avoid misdetecting the SPS activation or deactivation, the UE 120 detects that one or more conditions for semi-persistent scheduling (SPS) activation or deactivation based on downlink transmission are satisfied It is possible. The UE 120 may then generate one or more metrics related to the downlink transmission and may determine that a valid SPS activation or deactivation has occurred if the one or more metrics meet one or more criteria. In another example, the UE 120 may determine that a valid semi-persistent scheduling (SPS) activation has occurred. The UE 120 detects cyclic redundancy check (CRC) failures of a plurality of physical downlink shared control channel (PDSCH) and implicitly declares an SPS release based on the detection. You may.

FIG. 2 shows a block diagram of a design of a base station / eNB 110 and a UE 120, which may be one of the base stations / eNBs and UEs in FIG. The base station 110 may have T antennas 234a through 234t and the UE 120 may have R antennas 252a through 252r where T? 1 and R Gt;

At the base station 110, the transmit processor 220 receives data from the data source 212 for one or more UEs, and determines, based on channel-quality indicators (CQIs) received from the UEs, (E.g., encodes and modulates) data for each UE based on the MCS (s) selected for the UE, and selects one or more modulation and coding schemes And may provide data symbols for the UEs. Transmit processor 220 also processes system information and control information (e.g., CQI requests, grants, higher layer signaling, etc.) (e.g., for SRPI, etc.) and provides overhead symbols and control symbols You may. Processor 220 may also generate reference symbols for reference signals (e.g., CRS) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., pre-processing) on data symbols, control symbols, overhead symbols, and / Coding), and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process each output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from the modulators 232a through 232t may be transmitted via the T antennas 234a through 234t, respectively.

At UE 120, antennas 252a through 252r may receive downlink signals from base station 110 and / or other base stations and transmit the received signals to demodulators (DEMODs) 254a through 254r, respectively . Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) its received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain the received symbols. MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on received symbols, if applicable, and provide detected symbols. Receive processor 258 processes (e.g., demodulates and decodes) the detected symbols, provides decoded data for UE 120 to data sink 260, and provides decoded control information and system information Controller / processor 280. The controller / According to certain aspects of the present disclosure, the controller / processor 280 may be configured to perform the operations described herein. The channel processor 284 may determine RSRP, RSSI, RSRQ, CQI, etc., as described below.

On the uplink, at the UE 120, the transmit processor 264 receives data from the data source 262 and sends it to the controller / processor 280 (e.g., to reports including RSRP, RSSI, RSRQ, CQI, etc.) Lt; RTI ID = 0.0 > control information). ≪ / RTI > The processor 264 may also generate reference symbols for the one or more reference signals. The symbols from transmit processor 264 are precoded by TX MIMO processor 266 if applicable and further processed by modulators 254a through 254r (e.g., for SC-FDM, OFDM, etc.) And may be transmitted to the base station 110. At base station 110, the uplink signals from UE 120 and other UEs are received by antennas 234, processed by demodulators 232, and, if applicable, by MIMO detector 236 And may be further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. Processor 238 may provide the decoded data to data sink 239 and decoded control information to controller / processor 240. [

The controllers / processors 240 and 280 may direct the operation at the base station 110 and the UE 120, respectively. The processor 280 and / or other processors and modules at the UE 120 may perform operations 600 and / or 700 in Figures 6 and 7, and / or other processes for the techniques described herein Perform or direct. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. The scheduler 246 may schedule the UEs for data transmission on the downlink and / or the uplink.

FIG. 3 shows an exemplary frame structure 300 for FDD in LTE. The transmission timeline for each of the downlink and uplink may be partitioned in units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be partitioned into 10 subframes with indices of 0 to 9. Each subframe may include two slots. Each radio frame may thus comprise 20 slots with indices of 0 to 19. Each slot may comprise L symbol periods, for example, seven symbol periods for the normal cyclic prefix (as shown in FIG. 2) or six symbol periods for the extended cyclic prefix . The 2L symbol periods in each subframe may be assigned indices of 0 to 2L-1.

In LTE, the eNB may transmit the PSS and SSS on the downlink at the center 1.08 MHz of the system bandwidth for each cell supported by the eNB. The PSS and SSS may be transmitted in symbol periods 6 and 5, respectively, in subframes 0 and 5 of each radio frame with a normal cyclic prefix, as shown in FIG. The PSS and SSS may be used by the UEs for cell searching and retrieval. The eNB may send a cell-specific reference signal (CRS) over the system bandwidth for each cell supported by the eNB.

The CRS may be transmitted in certain symbol periods of each subframe and may be used by UEs to perform channel estimation, channel quality measurement, and / or other functions. The eNB may also transmit a Physical Broadcast Channel (PBCH) in symbol periods 0 to 3 in slot 1 of certain radio frames. The PBCH may also carry some system information. the eNB may transmit other system information such as system information blocks (SIBs) on a physical downlink shared channel (PDSCH) in predetermined subframes. The eNB may transmit control information / data on a Physical Downlink Control Channel (PDCCH) in the first B symbol periods of a subframe, where B may be configurable for each subframe . The eNB may transmit traffic data and / or other data on the PDSCH in the remaining symbol periods of each subframe.

The eNB may schedule the UEs using various scheduling mechanisms. One such mechanism is referred to as semi-persistent scheduling (SPS). When the eNB schedules the UE to the SPS, the eNB may allocate resources at one time and may cause the UE to use these resources instead of allocating resources more periodically. That is, the eNB may allocate a predefined amount of resources to the UE with a predetermined periodicity. Thus, the UE is not required to request resources for each transmission time interval (TTI), thus saving control plan overhead at the eNB. When semi-persistently scheduled, the UE needs to monitor the physical downlink control channel in each subframe since the eNB may activate / deactivate / release the SPS at any time using the downlink control information (DCI) There may be. However, in some scenarios (e.g., when the UE is experiencing interference), the UE may incorrectly detect the SPS activation or deactivation, wasting resources only. As such, aspects of the present disclosure may help the UE determine whether an actual SPS activation or deactivation has occurred, thereby alleviating the problem of wasted resources due to erroneous detection of the SPS activation or deactivation. That is, aspects of the present disclosure provide techniques for defending against false detection of SPS activation or deactivation.

4 shows two exemplary subframe formats 410 and 420 for the downlink with a normal cyclic prefix. The available time frequency resources for the downlink may be partitioned into resource blocks. Each resource block may cover 12 subcarriers in one slot and may contain multiple resource elements. Each resource element may cover one subcarrier in one symbol period and may be used to transmit one modulation symbol, which may be a real or a complex value.

The subframe format 410 may be used for an eNB with two antennas. The CRS may be transmitted from antennas 0 and 1 in symbol periods 0, 4, 7, and 11. The reference signal is a signal that is known a priori by the transmitter and the receiver and may also be referred to as a pilot. The CRS is a reference signal generated based on, for example, a cell identity (ID) specific to a cell. In Figure 4, for a given resource element with label Ra, the modulation symbol may be transmitted on its resource element from antenna a, and some modulation symbols may not be transmitted on that resource element from other antennas. The subframe format 420 may be used for an eNB with four antennas. The CRS may be transmitted from antennas 0 and 1 in symbol periods 0, 4, 7, and 11 and from antennas 2 and 3 in symbol periods 1 and 8. For both subframe formats 410 and 420, the CRS may be transmitted on uniformly spaced subcarriers that may be determined based on the cell ID. The different eNBs may send their CRSs on the same or different subcarriers, depending on their cell IDs. For both subframe formats 410 and 420, resource elements that are not used for CRS may be used to transmit data (e.g., traffic data, control data, and / or other data).

PSS, SSS, CRS, and PBCH in LTE are described in 3GPP TS 36.211, which is publicly available name "Evolved Universal Terrestrial Radio Access (E-UTRA)

The interlace structure may be used for each of the downlink and uplink to FDD in LTE. For example, Q interlaces with indices of 0 to Q-1 may be defined, where Q may be equal to 4, 6, 8, 10, or some other value. Each interlace may comprise subframes separated by Q frames. In particular, the interlace q may include subframes q, q + Q, q + 2Q, where q? {0, ..., Q-1}.

The wireless network may support hybrid automatic retransmission (HARQ) for data transmission on the downlink and uplink. For HARQ, the transmitter (eNB, for example) may transmit one or more transmissions of the packet until the packet is correctly decoded by the receiver (e.g., UE) or some other termination condition is encountered. In case of synchronous HARQ, all transmissions of a packet may be transmitted in a single interlace of subframes. For asynchronous HARQ, each transmission of a packet may be transmitted in any subframe.

The UE may be located within the coverage of multiple eNBs. One of these eNBs may be selected to serve the UE. The serving eNB may be selected based on various criteria such as received signal strength, received signal quality, path loss, and the like. The received signal quality may be quantified by signal-to-noise-and-interference ratio (SINR), or reference signal reception quality (RSRQ), or some other metric. The UE may operate in a predominant interference scenario where the UE may observe high interference from one or more interfering eNBs, which may result in false SPS detection or cancellation.

Exemplary techniques for defending against false detection of SPS activation or deactivation

As mentioned above, certain aspects of the present disclosure provide techniques for defending against adverse effects that may be caused by a user equipment (UE) that incorrectly detects positive SPS activation and misses an SPS release.

The SPS typically allows radio resources to be semi-statically configured and assigned to the UE for a longer period of time than one subframe. In this manner, the SPS may reduce the overhead by avoiding the need for specific downlink assignment messages or uplink grant messages on the physical downlink control channel (PDCCH) for each subframe. The SPS may be useful, for example, if the timing and amount of radio resources needed is predictable.

The SPS C-RNTI is configured on a Physical Downlink Control Channel (PDCCH) for semi-persistently scheduled Physical Downlink Shared Channel (PDSCH) data transmissions. Is the identifier of the transmitted scheduling messages. The SPS C-RNTI allows the UE to distinguish these messages from those used for dynamic scheduling messages identified by the Cell-Radio Network Temporary Identifier (C-RNTI). The SPS C-RNTI is typically transmitted as a scrambling code applied to a cyclic redundancy check (CRC) of a PDCCH transmission.

Misdetecting PDCCH for SPS DL activation or deactivation may result in a number of problems. The false detection of SPS-UL activation indicates that the implicit release SPS by the base station after consecutive empty transmissions of some number ('x') in the SPS UL (indicating that the UE has not detected activation) Lt; / RTI >

The missed DCI for the positive SPS activation payload (which means that the UE incorrectly declares activation as being detected when it is not transmitted) or the SPS release may cause the UE to request a SPS-C-RNTI that is wasteful It is possible to schedule DL decoding attempts, which may lead to unnecessary battery consumption. This scenario may continue until the network schedules a real activation payload. Unfortunately, due to mis-detected acknowledgment, the network may not be expecting UL acknowledgment / negative acknowledgments (ACK / NAKs) on the physical uplink control channel (PUCCH) resource, It may not be detected, and the time for correcting may be delayed.

Aspects of the present disclosure provide techniques that may help address this scenario. Generally, schemes will typically result in declaring a valid SPS activation or deactivation (e.g., the CRC parity bits obtained for the PDCCH payload are scrambled with the SPS C-RNTI and the new data indicator field is set according to 3GPP 36.213 section 9.2 May be accompanied by making further measurements by the UE after the detection conditions have been met.

According to certain aspects, additional measurements may include utilizing a decoding quality metric before declaring a valid SPS activation or deactivation. Examples of decoding quality metrics that may be utilized include some other divergence indicating the aggregate quality of the logarithm of the likelihood ratio (LLR) energy metrics, the Hamming distance, or the relationship between the decoded and input soft bits Or normalized metrics, for example. According to certain aspects, the UE generates a decoding quality metric for detection, even if the conditions for SPS activation or deactivation are met. The decoding quality metric may, for example, give the probability that the detected conditions actually correspond to the SPS activation or deactivation - or an indication when the conditions are erroneously detected. According to certain aspects, if the decoding quality metric is above a threshold, the UE may declare that a valid SPS activation or deactivation is detected. If the decoding quality metric is not higher than the threshold level, the likelihood of false detection is higher and the corresponding acknowledgment may be discarded (or pruned). Thus, the UE may not determine that SPS activation or deactivation has been detected if the decoding quality metric is below a threshold.

In some cases, the UE may implement a comparison rule to check for erroneous C-RNTI detection when the SPS-enable / disable is transmitted. In this case, since the UE will only decode grants scrambled with C-RNTI in the event of a collision, such a comparison rule may be applied to the C-RNTI / UE with a lower decoding quality metric and / or symbol error rate (SER) It may also be used to remove SPS-C-RNTI authorization. In this case, the UE may help prevent a mis-detected C-RNTI acknowledgment if a lower decoding quality metric or SER is detected (e.g., for other acknowledgments in the same subframe).

According to certain aspects, additional measurements may include measurements that may help the UE to escape cycles (of unnecessary decoding attempts) in the event that the UE mis-detects the SPS activation or misses the SPS release. For example, a false positive SPS activation may be suspected in the event of PDSCH CRC failures for some number of consecutive SPS-DL grants, which is lower than that of the normalized PDSCH symbol energy passing. Upon detecting this case, the UE may implicitly determine to release the SPS allocation. In some cases, the UE performs additional checks that can compare, for example, the reference signal receive power (RSRP) and / or the reference signal receive quality (RSRP / RSRQ) and the C-RNTI decode success rate (if any) You may. The basic assumption with these operations is that any subsequent CRC failures for the SPS-C-RNTI (not shown for C-RNTI) under good channel conditions (e.g., unscheduled DL for SPS-C- Lt; RTI ID = 0.0 > (e. ≪ / RTI >

This implicit deallocation may also help addressing the case of missing the DCI for SPS release (and in the event that the network does not immediately reschedule release), which may also result in consecutive DL CRC failures. Utilizing this approach may be applicable for TDD due to ACK / NACK bundling, because the NACK generated for the SPS may also affect the real C-RNTI scheduling.

FIG. 5 illustrates an example system in which UE 520 may operate in accordance with aspects of the present disclosure. As illustrated, the base station 510 (eNodeB, for example) is configured with an SPS scheduling module (eNodeB) configured to signal SPS activation or deactivation (e.g., via a properly scrambled PDCCH payload) 514). The UE 520 may receive transmissions from the BS via the receiver module 526 and the SPS enable / disable detection module 524 may apply the techniques described above to defend against false SPS disable / enable detection It is possible.

Figure 6 illustrates exemplary operations (e. G., The UE 120 and / or the UE 520) that may be performed by the UE (e. G., The UE 120 and / or the UE 520) to defend against erroneous SPS release / activation detection, 600). At 602, the UE detects that one or more conditions for activating or deactivating the SPS are satisfied based on the downlink transmission. At 604, the UE generates one or more metrics related to the downlink transmission. At 606, the UE determines that a valid SPS activation or deactivation has occurred if one or more metrics meet one or more criteria.

7 may be performed by a UE (e.g., UE 120 and / or UE 520) to escape the conditions caused by erroneous SPS activation or unacknowledged SPS release, in accordance with aspects of the present disclosure. Lt; / RTI > illustrate example operations 700 of FIG. At 702, the UE determines that a valid SPS activation has occurred. At 704, the UE detects multiple consecutive PDSCH CRC failures. At 706, the UE implicitly declares an SPS release based on its detection.

The various operations of the above-described methods may be performed by any suitable means capable of performing corresponding functions. The means may include various hardware and / or software / firmware component (s) and / or module (s), including, but not limited to, circuitry, an application specific integrated circuit (ASIC) In general, when there are operations illustrated in the Figures, the operations may be performed by any suitable corresponding means-plus-function components.

For example, means for detecting, means for generating, means for determining, and means for declaring may be implemented in the receiving processor 258 and / or the controller / processor 280 of the UE 120 illustrated in FIG. 2, And / or receiver module 526 and / or SPS enable / disable detection module 524 illustrated in FIG.

Those skilled in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may refer to voltages, currents, electromagnetic waves, magnetic fields or particles, Optical fields or particles, or any combination thereof.

Those skilled in the art will also appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

The various illustrative logical blocks, modules, and circuits described in connection with the disclosure herein may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array Capable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but, in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. One exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. Alternatively, the storage medium may be integral with the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. Alternatively, the processor and the storage medium may reside as discrete components in a user terminal.

In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored or transmitted on one or more instructions or code as computer readable media. Computer-readable media includes both communication media and computer storage media including any medium that facilitates transfer of a computer program from one place to another. The storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, General purpose or special-purpose computers that may be used to carry or store data, or any other medium that can be accessed by a general purpose or special purpose processor. Also, any connection is appropriately referred to as a computer readable medium. For example, if the software is transmitted from a web site, server, or other remote source using wireless technologies such as coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or infrared, radio, and microwave, Include coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave. Disks and discs as used herein include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVD), floppy discs and Blu-ray discs, discs usually reproduce data magnetically, while discs reproduce data optically with a laser. Combinations of the above should also be included within the scope of computer readable media.

As used herein, including the claims, the term "and / or" means that any one of the listed items may be employed alone, as used in the list of two or more items, Any combination of two or more of the items may be employed. For example, if a composition is described as comprising components A, B, and / or C, the composition may be A alone; B alone; C alone; A and B are combined; A and C are combined; B and C in combination; Or A, B, and C in combination. Also, as used herein, including claims, "or" is used in a list of items (e.g., a list of items that begins with a phrase such as " Likewise, for example, a disconnection list is displayed such that the list of "at least one of A, B, or C" means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) .

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit and scope of the disclosure. Accordingly, the present disclosure is not intended to be limited to the examples and designs described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (20)

A method for wireless communication by a user equipment (UE)
Detecting that one or more conditions for semi-persistent scheduling (SPS) activation or deactivation are satisfied based on downlink transmission;
Generating one or more metrics associated with the downlink transmission; And
Determining that a valid SPS activation or deactivation has occurred if the one or more metrics meet one or more criteria
Gt; (UE) < / RTI > The method according to claim 1,
Wherein the one or more metrics comprise a decoding quality metric; And
Wherein the one or more criteria comprises the decoding quality metric exceeding a threshold value. 3. The method of claim 2,
Wherein the decoding quality metric is generated based on a physical downlink control channel (PDCCH) with a payload transmitted in a manner that meets the one or more conditions. 3. The method of claim 2,
Wherein the decoding quality metric is generated based on an SPS-Cell-Radio Network Temporary Identifier (C-RNTI) acknowledgment; And
Wherein the threshold is based on a decoding quality metric of another acknowledgment in the same subframe. 3. The method of claim 2,
Wherein the decoding quality metric comprises at least one of an LLR energy metric, a Hamming distance, or some other metric indicative of the aggregate quality of the relationship between the decoded bits and the input soft bits. ≪ / RTI > 3. The method of claim 2,
Wherein the decoding quality metric provides an indication of the probability that the one or more conditions detected correspond to an SPS activation or deactivation. A method for wireless communication by a user equipment (UE)
Determining that valid semi-persistent scheduling (SPS) activation has occurred;
Detecting a plurality of physical downlink shared control channel (PDSCH) cyclic redundancy check (CRC) failures; And
Implicitly declaring an SPS release based on the detected multiple PDSCH CRC failures
Gt; (UE) < / RTI > 8. The method of claim 7,
Wherein the detecting comprises detecting a plurality of consecutive PDSCH CRC failures. 8. The method of claim 7,
The step of implicitly declaring the SPS release comprises: by the user equipment (UE) based on at least one of a reference signal received power (RSRP), a reference signal reception quality (RSRQ), or a symbol error rate Method for wireless communication. 8. The method of claim 7,
The step of implicitly declaring the SPS release comprises comparing a RSRP with a Cell-Radio Network Temporary Identifier (C-RNTI) decode success rate or a comparison between the RSRQ and the C-RNTI decode success rate (UE) based on at least one of the following: An apparatus for wireless communication by a user equipment (UE)
At least one processor; And
A memory coupled to the at least one processor,
The at least one processor comprising:
Detecting that one or more conditions for semi-persistent scheduling (SPS) activation or deactivation based on downlink transmission are satisfied;
Generate one or more metrics associated with the downlink transmission; And
If the one or more metrics meet one or more criteria, determine that a valid SPS activation or deactivation has occurred
(UE). ≪ / RTI > 12. The method of claim 11,
Wherein the one or more metrics comprise a decoding quality metric; And
Wherein the one or more criteria comprises the decoding quality metric exceeding a threshold value. 13. The method of claim 12,
Wherein the decoding quality metric is generated based on a physical downlink control channel (PDCCH) with a payload transmitted in a manner that meets the one or more conditions. 13. The method of claim 12,
Wherein the decoding quality metric is generated based on an SPS-C-RNTI acknowledgment; And
Wherein the threshold is based on a decoding quality metric of another acknowledgment in the same subframe. 13. The method of claim 12,
Wherein the decoding quality metric comprises at least one of an LLR energy metric, a Hamming distance, or some other metric indicative of the aggregate quality of the relationship between the decoded bits and the input soft bits. / RTI > 13. The method of claim 12,
Wherein the decoding quality metric provides an indication of the probability that the one or more conditions detected correspond to an SPS activation or deactivation. An apparatus for wireless communication by a user equipment (UE)
At least one processor; And
A memory coupled to the at least one processor,
The at least one processor comprising:
Determines that a valid semi-persistent scheduling (SPS) activation has occurred, and detects multiple Physical Downlink Shared Control Channel (PDSCH) cyclic redundancy check (CRC) failures Detecting; And
And to implicitly declare an SPS release based on the detected multiple PDSCH CRC failures
(UE). ≪ / RTI > 18. The method of claim 17,
Wherein the detecting comprises detecting a plurality of consecutive PDSCH CRC failures. 18. The method of claim 17,
Wherein the at least one processor is configured to implicitly declare the SPS release based also on at least one of a reference signal receive power (RSRP), a reference signal receive quality (RSRQ), or a symbol error rate (SER) A device for wireless communication by a device (UE). 18. The method of claim 17,
The implicit declaration of the SPS may include a comparison between the RSRP and a Cell-Radio Network Temporary Identifier (C-RNTI) decode success rate or a comparison between the RSRQ and the C-RNTI decode success rate (UE) based on one of the first and second base stations.

Images